Facile preparation of a novel biomass-derived H3PO4 and Mn(NO3)(2) activated carbon from citrus bergamia peels for high-performance supercapacitors

Author(s)

Gehrke, Veridiana ^[1] ; Maron, Guilherme Kurz ^[1] ; Rodrigues, Lucas da Silva ^[1] ; Alano, Jose Henrique ^[2] ; de Pereira, Claudio Martin Pereira ^{[1, 3]} ; Orlandi, Marcelo Ornaghi ^[4] ; Carren, Neftali Lenin Villarreal ^[1]

Affiliation

^[1] Univ Fed Pelotas, Grad Program Mat Sci & Engn, Technol Dev Ctr, BR-96010000 Pelotas, RS - Brazil

^[2] Fed Univ Rio Grande FURG, PPMec, Campus Carreiros, Italia Ave, Km 8, BR-96203E90 Rio Grande, RS - Brazil

^[3] Univ Fed Pelotas, Lab Lipid & Bioorgan, Av Eliseu Macieu Bldg 31, BR-96010900 Capao do Leao, RS - Brazil

^[4] Sao Paulo State Univ, Interdisciplinary Lab Ceram, IQ, Av Prof 16, Francisco Degni, 55, BR-14800060 Araraquara, SP - Brazil

• Document type: Journal article
• Source: MATERIALS TODAY COMMUNICATIONS; v. 26, MAR 2021.
• Web of Science Citations: 2

Abstract

The increase in global energy demand, with consequent environmental effects caused by the extensive use of fossil fuels, resulted in the intensification of studies concerning the development of new sustainable processes of energy storage. Aiming to solve issues like complex fabrication processes, high cost and side effects on the environment, the use of activated carbons derived from residual biomass as electrodes for energy storage devices has attracted much attention. In this study, activated carbons derived from citrus bergamia peels activated with phosphoric acid (AC - H3PO4) and manganese nitrate (AC - Mn3O4) were produced, and its chemical, structural, morphological and electrochemical properties were evaluated as electrodes for supercapacitor. The electrochemical properties were studied by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge, revealing the excellent performance of both AC - H3PO4 and AC - Mn3O4 , materials. The maximum value of specific capacitance was achieved by AC - Mn3O4, reaching 289 F.g(-1) at a current density of 0.1 Asg(-1). Outstanding results regarding energy density in ionic liquid electrolyte were also obtained, with values of 50.8 Wh kg(-1) at a power density of 240 W kg(-1). (AU)

• FAPESP's process: 15/50526-4 - Electrolyte gating of metal oxide films:towards low power and printable electronics
• Grantee: Marcelo Ornaghi Orlandi
• Support Opportunities: Regular Research Grants